Price is for 1 dual triode vacuum tube. With O-getter with one support, cooper or gold post rods. Tube is produced in the US.
Tested VERY STRONG as follow:
Ia1 = 9.6 mA | S1 = 2.0 mA/V | Ri1 = 8.6 kOhm | μ1 = 17.2
Ia2 = 9.0 mA | S2 = 1.9 mA/V | Ri1 = 8.7 kOhm | μ1 = 16.5
Test under: Uf = 12.6V | Ua = 250V | Ug = -8.5V
Good starts from Ia=7.00mA and S=1.50mA/V and 100% is Ia=10.5mA and S=2.2mA/V
Shipping will be Airmail registered with tracing number. Other shipping methods available on request.